package com.rtgroup.tango.trader.rts_docking;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;

//~--- classes ----------------------------------------------------------------

/*
* LayeredPaneDemo.java requires
* images/dukeWaveRed.gif.
 */
public class LayeredPaneDemo extends JPanel implements ActionListener, MouseMotionListener {
    private static String LAYER_COMMAND = "layer";

    // Action commands
    private static String ON_TOP_COMMAND = "ontop";

    // Adjustments to put Duke's toe at the cursor's tip.
    private static final int XFUDGE = 40;
    private static final int YFUDGE = 57;

    //~--- fields -------------------------------------------------------------

    private String[]     layerStrings = { "Yellow (0)", "Magenta (1)", "Cyan (2)", "Red (3)", "Green (4)" };
    private Color[]      layerColors  = { Color.yellow, Color.magenta, Color.cyan, Color.red, Color.green };
    private JLabel       dukeLabel;
    private JComboBox    layerList;
    private JLayeredPane layeredPane;
    private JCheckBox    onTop;

    //~--- constructors -------------------------------------------------------

    public LayeredPaneDemo() {
        setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));

        // Create and load the duke icon.
        final ImageIcon icon = createImageIcon("images/dukeWaveRed.gif");

        // Create and set up the layered pane.
        layeredPane = new JLayeredPane();
        layeredPane.setPreferredSize(new Dimension(300, 310));
        layeredPane.setBorder(BorderFactory.createTitledBorder("Move the Mouse to Move Duke"));
        layeredPane.addMouseMotionListener(this);

        // This is the origin of the first label added.
        Point origin = new Point(10, 20);

        // This is the offset for computing the origin for the next label.
        int offset = 35;

        // Add several overlapping, colored labels to the layered pane
        // using absolute positioning/sizing.
        for (int i = 0; i < layerStrings.length; i++) {
            JLabel label = createColoredLabel(layerStrings[i], layerColors[i], origin);

            layeredPane.add(label, new Integer(i));
            origin.x += offset;
            origin.y += offset;
        }

        // Create and add the Duke label to the layered pane.
        dukeLabel = new JLabel(icon);

        if (icon != null) {
            dukeLabel.setBounds(15, 225, icon.getIconWidth(), icon.getIconHeight());
        } else {
            System.err.println("Duke icon not found; using black square instead.");
            dukeLabel.setBounds(15, 225, 30, 30);
            dukeLabel.setOpaque(true);
            dukeLabel.setBackground(Color.BLACK);
        }

        layeredPane.add(dukeLabel, new Integer(2), 0);

        // Add control pane and layered pane to this JPanel.
        add(Box.createRigidArea(new Dimension(0, 10)));
        add(createControlPanel());
        add(Box.createRigidArea(new Dimension(0, 10)));
        add(layeredPane);
    }

    //~--- methods ------------------------------------------------------------

    /** Returns an ImageIcon, or null if the path was invalid. */
    protected static ImageIcon createImageIcon(String path) {
        java.net.URL imgURL = LayeredPaneDemo.class.getResource(path);

        if (imgURL != null) {
            return new ImageIcon(imgURL);
        } else {
            System.err.println("Couldn't find file: " + path);

            return null;
        }
    }

    // Create and set up a colored label.
    private JLabel createColoredLabel(String text, Color color, Point origin) {
        JLabel label = new JLabel(text);

        label.setVerticalAlignment(JLabel.TOP);
        label.setHorizontalAlignment(JLabel.CENTER);
        label.setOpaque(true);
        label.setBackground(new Color(color.getRed(), color.getGreen(), color.getBlue(), 126));
        label.setForeground(Color.black);
        label.setBorder(BorderFactory.createLineBorder(Color.black));
        label.setBounds(origin.x, origin.y, 140, 140);

        return label;
    }

    // Create the control pane for the top of the frame.
    private JPanel createControlPanel() {
        onTop = new JCheckBox("Top Position in Layer");
        onTop.setSelected(true);
        onTop.setActionCommand(ON_TOP_COMMAND);
        onTop.addActionListener(this);
        layerList = new JComboBox(layerStrings);
        layerList.setSelectedIndex(2);    // cyan layer
        layerList.setActionCommand(LAYER_COMMAND);
        layerList.addActionListener(this);

        JPanel controls = new JPanel();

        controls.add(layerList);
        controls.add(onTop);
        controls.setBorder(BorderFactory.createTitledBorder("Choose Duke's Layer and Position"));

        return controls;
    }

    // Make Duke follow the cursor.
    public void mouseMoved(MouseEvent e) {
        dukeLabel.setLocation(e.getX() - XFUDGE, e.getY() - YFUDGE);
    }

    public void mouseDragged(MouseEvent e) {}    // do nothing

    // Handle user interaction with the check box and combo box.
    public void actionPerformed(ActionEvent e) {
        String cmd = e.getActionCommand();

        if (ON_TOP_COMMAND.equals(cmd)) {
            if (onTop.isSelected()) {
                layeredPane.moveToFront(dukeLabel);
            } else {
                layeredPane.moveToBack(dukeLabel);
            }
        } else if (LAYER_COMMAND.equals(cmd)) {
            int position = onTop.isSelected()
                           ? 0
                           : 1;

            layeredPane.setLayer(dukeLabel, layerList.getSelectedIndex(), position);
        }
    }

    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {

        // Create and set up the window.
        JFrame frame = new JFrame("LayeredPaneDemo");

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // Create and set up the content pane.
        JComponent newContentPane = new LayeredPaneDemo();

        newContentPane.setOpaque(true);    // content panes must be opaque
        frame.setContentPane(newContentPane);

        // Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {

        // Schedule a job for the event-dispatching thread:
        // creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}
